ReportViewer.aspx update doesn't affect report manager that is why it is still working.
Need to update report.aspx under reportmanager for it to take affect

Instead of commenting out the roles check in views. I added new role ssis_reports with no additional permissions. Added following to the 2 views mentioned above. Who ever needs access...

If you can provide the command\statement you are running then it would be easier to check what is the issue. xp_delete_file deletes only native SQL backups and for extension value...